I have actually wondered why no one has made a real gambling dapp for Steem yet since they seem to be very popular on other blockchains. So it's good to see that it's here. I'm not a gambling person myself, but if people are going to gamble anyway I prefer it to be on the Steem blockchain ;)
Anyway, good job with the dapp. The design and function seem to very good, and I'm sure this will attract a lot of people.